Visible precision bearing testing tool



April 4, 1950 s. o. STANFIELD 2,502,601

' VISIBLE PRECISION BEARING 'TESTING TOOL Filed Feb. 19, 1947 2 Sheets-Sheet l 2 I Fig.2. "I I 3 Q 3 Ql 3 30 I PFig. 5.

Inventor April 4, 1950 Filed Feb. 19, 1947 S. O. STANFIELD VISIBLE PRECISION BEARING TESTING TOOL '22 h A v 4 29 2 -9 Fig.3.

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, VIIIIIIEFI/VIIIIIIAE IIIIIIA \\\I-E\\ -I\\\ III III 7 20 Stephen 0. Stanfield Patented Apr. 4, 1950 UNITED STATES PATENT OFFICE Stephen 0. Stanfield, santa Ana, Calif.

Application February 19, 1947, Serial No. 729,513

5 Claims.

This invention relates to improvements in visible precision bearing testing tools.

An object of the invention is to provide an improved visible precision bearing testing tool for internal combustion engines for accurately checking the amount of looseness in the engine bearings.

Another object of the invention is to provide an improved visible precision bearing testing tool for checking the amount of looseness in internal combustion engine bearings, said tool including a bracket, a bell crank lever, a precision indicating needle and a dial, with bolts for attaching the testing tool.

A further object of the invention is to provide an improved form of visible precision bearing testing tool for internal combustion engine bearings which will quickly and accurately test and visibly indicate the condition of the main bearings and connecting rod bearings, and also test for piston slap and tightness of the wrist pins and for connecting rod bossing.

A still further object of the invention is to provide an improved form of visible precision bearing testing tool for internal combustion engine bearings which will be highly efficient in operation, and relatively inexpensive to manufacture and produce.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application,

Figure 1 is a sectional View through an internal combustion engine block with its oil pan removed showing the improved visible precision bearing testing tool in position thereon for testing the main crank shaft bearings;

Figure 2 is a similar view to Figure 1, but with the visible precision bearing testing tool in position for testing a connecting rod bearing;

Figure 3 is a similar View to Figure 1, but with the visible precision bearing testing tool in position for testing a wrist pin;

' Figure 4 is a similar view to Figure 1, but with the visible precision bearing testing tool in posi-' tion for testing for piston slap;

Figure 5 is an exploded view of the several parts making up the improved visible precision bearing testing tool; I I Figure 6 is a sectional View taken on the line .66 of Figure 3, and

Figure '7 is a sectional view taken on the line '|1 of Figure 3.

Like characters of reference are used throughout the following specification and the accom- 2 panying drawings to designate corresponding parts.

In carrying out the invention, there is provided and illustrated an internal combustion engine cylinder block generally designated by the reference numeral I having the usual cylinders 2, water jacket 3 and bottom supporting flange 4 to which the oil pan (not shown) will be attached and secured.

For testing the engine bearings, the oil pan (not shown) will first be removed, and for testing the main bearings, the T-shaped bracket which includes the cross piece formed with the spaced slots 5 and 1 and the depending arm 8, will be attached by the bolts 9 to the flange 4 on the lower edgeof the engine cylinder block I. Upper and lower apertures l0 and. H are formed through the depending arm 8 of the bracket, and serve to respectively support the precision indicating needle l2 and the hinge pin 13.

A bell crank lever generally designated by the reference numeral l4 comprises a transversely or longitudinally extending arm [5 which is slotted at It in its outer end, and is also slotted at I! adjacent the middle thereof. A rectangular shaped slot I8 is formed in the inner end of said arm [5, and is adapted to receive the lower end of the depending arm 8, said bell crank lever l4 being pivotally supported upon the hinge pin I3 which extends through the arm 8 of the bracket which is attached to the flange 4 about the engine cylinder block I.

The precision indicating needle [2 overlies the arcuate calibrated dial section or quadrant l9 suitably formed on the surface of the bell crank lever l4.

The lower or depending vertical end 20' of the bell crank lever l4 extends downwardly a considerable distance below the hinge pin l3 and is longer than the horizontal or longitudinal portion I5 of said bell crank lever l4 to provide a hand engaging operating lever which will be moved or rocked back and forth while making a test to indicate any degree of looseness of the bearing upon the scale Hi.

In making the connecting rod bearing test, the nuts 23 on the connecting rod cap bolts 24 are removed and the stud extensions 25 are threaded on the bolts 24 with the reduced lower threaded ends 21 "and 28 of the studs 25 disposed in and through the slots I6 and I! in the arm [5 of the bell crank lever l4 and the nuts 23 threaded on the threaded ends 21 and 28 of said studs 25, whereupon rocking back and forth on the depending hand lever 20 will give a visible indicaand the quadrant [9 if there is looseness in the Y connecting rod bearing, whereasna loosenessin,

the main bearing is shown by an identical as-,,-

sembly of the testing tool except that a stronger force will be applied to the handleverln -toadd i to the movement and will bemoted by theadded.

movement of the indicating needle l2 in connection with the quadrant H].

In the main bearing; test, the caps 21 of the main bearings 22 "are not; molested inthistestfor main bearing looseness.

In making. the test 'for looseness of wrist pins as'illustratedinFigure 3 of. the drawings, the connectingrod 2B-will be removed from thecrank shaft 29,. and a light rockingmotionof the hand lever ilfil will cause the wristpin 3El-to jump back and forth in its. bearing according. to its' amount of looseness, being sure not to rock. the lever hard enough tomove; the piston 3 l. The: amount of aloosenesscan bednstantly readupon the, scale quadrantl 9;

The pistonazslap test :is. shown in Figure 4. wherein;- the bracket is unboltedfromthe {crank case flange Land theg-bell crank :lever Misconnected totheconnecting rod bearings. Since the crank-Journal, acts as the fulcrum when the. lever 20 is rocked-back :and for.th,. the piston. 3 I may be heard and seenato slap from side to side-in the cylinder 2 according .to the, amount .of looseness. The upper j dead center positionsbeing preferable fonthis, test as :the largest amoun-tof looseness will; there be shown.

To. test for connecting rodnbossing,v the assembly-isarran-ged as intheztest for piston-slap, only the hand -lever 26 .will .be. rocked. back. and-..forth in; a direction parallel with the..crankchaft. 2t. If; there, is -bos-sing-,; theupperend of; the-connect.- ing.-rod-;may be both seen and. heard striking a ainsttheapistonboss.v

Bymsing-the improved- Visible precision bearing testing tool in the manner hereinbefore... dew. scribed; a; mechanic, may, ascertain quickly. and accuratelyther condition of thefseveralbearings of-an internal combustion. engine, and. take-the proper steps to correct any necessaryrepair thereto;

From the foregoing description it, will. be. seen that .there has been. devisedand providedla. highly efficientdvisible. precision, bearing, testing tool which .will be accurateand relatively inexpensive to manufacture and-produce.

While the preferred embodiment of theinstant invention hasbeen illustrated .anddescribed it will be understood that .it is-not intended to, limit the scopeoftheinventi'on. thereto, as .manyminor changes, in detail of construction may be resorted to without departure from the. spiritnf the ..in.-. vention.

Hayingthus described my invention whatl 4 claim as new and desire to secure by Letters Patent of the United States is:

1. In combination with a cylinder block of an internal combustion engine, of a visible precision bearing testing tool including a bracket detachably secured to said cylinder block, a bell crank lever pivotally supported on said bracket, a pointer and scale respectively disposed on said bracket and bell crank. lever, means .011 one arm of said-bell crank lever for attaching the same to an engine bearing, and the other arm of said bell crank lever being rockable to cause the looseness-betweenthe-bearing assemblies to be indicated by said pointer on said scale.

2. In combination with a cylinder block of an internal combustion engine, of a visible precision bearing .testingtool including a T-shape bracket detachably secured to said cylinder block, a bell cranklever having a horizontal arm and a vertical arm pivotally supported on said T-shape bracket, a pointer and scale respectively I disposed on said bracket and bell crankglever, the horizontal arm of said bell crankulever being slotted, means engageable insaid: slots, for. at taching said arm to anengine bearing, and said other arm of the bell crank lever being rockable to cause the looseness between the bearing as-; semblies-to be indicated by saidpointeron. said scale.

3.- In combination with a-cylinderblock .of an internal combustion engine, of a-Visible precision bearing. testing .tool comprisinga-support, means forremovably securing the support to the-cylinder block, lever means pivotally carried-by the support, attachment means for securing-the .lever means to anengine-bearing, indiciaprovided on the lever means, andmeanscarriedby the support registeringwith the indicia to indicate the looseness between the bearingassemblies as the lever means is actuated;

4.. The combination of claim- 3 wherein; said lever means includes a longitudinal slot, and said, support. includes. a depending .armpivotally mounted inthe slot provided in thetlever-means;

. 5. .In combination with acylindenblock-of an internal combustion. engine, of. means for testing and. indicatingthe looseness of theqmain, crank shaft bearing of the engine, said-meanscompris ing a lever pivotally secured to .thecylinder block, means for removably securing the lever to the maincrank shaftbearing oi the engine, said lever being movable to effect a forceonythe crankshaft bearing of the engine, andmeans for indicating the degree .of movement of the main. crank shaft bearing of the. engine, relative to the cylinder block STEPHEN .0; STANEIELD.

REFERENCES CITED...

The following references .are .of record zinxthe fileofthis patent:

UNITED STATES.;PATENTS..

Number Name. Date 1,753,575: Milne Apr; 8,1930

FOREIGN: .PATENTS.--

Number Country- Date 97,468 Ger-many May 29, 1897 

